Pre-order Select Windows 8 Software, Get a $30 Amazon.com Promotional Credit
Through October 20, 2012, purchase select Windows 8 software and get a $30 Amazon.com promotional credit toward the purchase of items shipped and sold by Amazon.com (certain exclusions apply, including Kindle books, MP3s, and video rentals and downloads). The promotional credit will be emailed thirty days after your order ships. Offer valid when shipped and sold by Amazon.com. See full terms and conditions for more details.

I should also mention that while Windows 8 doesn't currently use the same software delivery architecture that XBox and mobile do, the potential is absolutely there. The CEO of Valve was concerned enough about it that he came out publicly against it.

If you are a gamer, I would at least think carefully before upgrading.

How's it do in virtualization? I wouldn't mind dropping it into my home lab, but I'm a little worried about system resources. My iMac is on its last legs waiting for the next upgrade and the current one is a little slim on RAM. Plenty for Win7 for my purposes and definitely XP, but I'm thinking this will require some additional horsepower.